console.log(global); // 全局对象global
console.log(global.global === global); // global里面放了一个global属性,其实就是他自己
console.log(global.setTimeout);
console.log(global.setInterval);
console.log(global.setImmediate);
console.log(global.console);
console.log(global.console.log);

console.log('========================')

const buffer = Buffer.from("abcdefg","utf-8");
console.log(buffer); //使用或者输出时可能往往会使用16进制表示



console.log(os.EOL); // 换行符





